Embodiments are directed towards employing a plurality of tag states to control tag suspension based on an asynchronous process that proactively monitors tag performance, response times, and latency. Tags may be in one of multiple states. Tags in a NORMAL state or a FLAGGED state may be enabled for deployment, and tags in a SUSPENSION_A state or a SUSPENSION_B state may be blocked from deployment. A tag's state may change based on monitoring the tag's latency to determine if latent events occur. Tag latency may be asynchronously monitored independent of web page requests. If latent events occur, then the tag's state may change from NORMAL to FLAGGED, from FLAGGED to SUSPENSION_A, or from SUSPENSION_B to SUSPENSION_A. If non-latent events occur, then the tag's state may change from SUSPENSION_B to FLAGGED or from FLAGGED to NORMAL, while a tag's state may change from SUSPENSION_A to SUSPENSION_B after a predetermined time period.